Murray, who is struggling to recover from a hip surgery, was in tears as he spoke to journalists here, the BBC reported.
"I'm not sure I'm able to play through the pain for another four or five months," said the Scot.
"I want to get to Wimbledon and stop but I'm not certain I can do that."
Murray conceded: "I'm not feeling good, I've been struggling for a long time.
"I've been in a lot of pain for about 20 months now. I've pretty much done everything I could to try and get my hip feeling better and it hasn't helped loads.
"I'm in a better place than I was six months ago but I'm still in a lot of pain. I can still play to a level, but not a level I have played at."
The former world number one had surgery on his right hip last January and has played 14 matches since returning to the sport last June.
Murray ended his 2018 season in September to spend time working with rehabilitation expert Bill Knowles, but still looked short of the required level when he played world number one Novak Djokovic in an open practice match at Melbourne Park on Thursday.
He has won two other grand slams and is the lone man to win back-to-back Olympic singles gold medals.
Murray received a knighthood for his tennis achievements and charity work on the eve of 2017.
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